Rivet-spinning machine.



W. P. SENG. RIVET SPINNING MACHINE. APPLIOATION FILED P21115. 1909.

Patented Nov. 9, L9`09f C llll "IIIX WENDELIN 1?. SENG, 0F CHICAGO,ILLINOIS.

RIVET-SPINN ING MACHINE.

Specification of Letters Patent.

Patented Nov. 9, 1909.

Application filed February 15, 1909. Serial No. 478,079.

To att whom it may concern.Y

Be it known that I, WnNDnLrN P. SENG, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain Improvements in Rivet-Spinning Machines, of which thefollowing is a specification.

This invention is an improvement in that type of riveting machines whichare provided with a pair of grooved rollers, carried by a rotaryspindle, and operate to swage a head on the end of the rivet as thespindle is moved to press the rollers against said rivet, and thepresent invention relates more especially to that class of such machinesin which the companion swaging rollers are disposed transversely and areprovided with gudgeons bearing in the spindlehead. In the operation ofthe machine these rollers are subjected to considerable strain bypressure against the rivet in upsetting the end of the same, and theexcessive friction of the bearing parts in the spindle-head oftenresults in preventingthe rollers from turning, thereby causing unevenwear on the working surfaces of the rollers, as well as undue strain onthe bearings of the machine, and heating of the rivet. In order toprevent this excessive friction on the bearing surfaces of the swagingrollers and spindlehead I provide a particular construction andarrangement of parts, all as hereinafter fully described andspecifically set forth in the appended claims.

In the accompanying drawings, which form a part of thisspeciiicationzFigure 1 is an end view of a rotary tool for rivetspinning machines, showing the arrangement of the swaging rollers. Fig.2 is a vertical sectional view, to show one arrangement for reducing thefriction of the parts. Fig. 3 is a transverse sectional view, on theline 3 3 of Fig. 2. Fig. 4 is a vertical sectional view, showingamodiication of the invention. Like numerals of reference indicate likeparts in the several views of the drawings.

Referring to the drawings, 1 designates the spindle-head of a rotarytool. for riveting machines, said head being provided at its lower endwith a pair of circular recesses 2 2, which are adapted to receive theswaging rollers 3, and so that said rollers will be disposed side byside and approximately in contact with each other. At the bottom of eachrecess 2 there is a central bore 4 extending into the spindle-head andinto which projects a gudgeon 5 formed on the swaging roller.

The swaging rollers are each provided with a peripheral groove 6, andsaid grooves register with a transverse opening 7 through thespindle-head adapted to receive a driftpin 8 for holding the rotatablerollers in the spindle-head. The outer ends of the rollers are providedwith grooves 9, which coperate to swage a head on the end of the rivetof the desired shape.

In order to reduce the friction of the swaging rollers in thespindle-head I provide each roller with anti-friction bearings, andherein disclose two forms of such devices. The form shown in Figs. 2 and3 comprises anti-friction balls 10, which surround the gudgeon 5 and areinterposed between the inner side of the roller and bottom of the recess2 in the spindle-head. These anti-friction balls are of such size thatthey not only provide the bearing between the inner side of the rollerand bottom of the recess, thereby forming an anti-friction end-thrustbearing, but also provide an antifriction bearing between the gudgeonand side wall of said recess to reduce the friction due to lateralstrain on the swaging rollers in operation.

In the modification shown in Fig. 4 the friction due to the lateralstrain on the rollers is relieved by means of anti-friction rollers 11surrounding the gudgeon 5 of each swaging-roller 3, and an anti-frictionendthrust bearing is provided for by means of anti-friction balls 12interposed between the inner end of the gudgeon and bottom of the bore,as 13, in the spindle-head. In this modification of the invention thebore 13 in the spindle-head is enlarged for a portion of its length, asat 14, to receive the anti-friction-rollers which surround the gudgeon.

In each instance, as will be seen, the friction due to the longitudinaland lateral strain on the swaging-rollers in operation is reduced to aminimum, so that the swagingrollers may rotate freely in forming a headon the end of the rivet.

Having thus described my invention, what I claim as new and desire tosecure by Letters-Patent, is

1. A rotary tool for riveting machines, comprising a rotary spindle, apair of rollers `mounted in the end of the spindle, gudgeons projectingfrom the center of the rollers into said spindle, and anti-frictionbea-rings between the gudgeons and spindles ior relieving the end-thrustand lateral strain on the rollers, substantially as shown and described.

2. A rotary tool for riveting machines, comprising a rotary spindlehaving a pair of circular recesses in its end and bores eX- tending intothe spindle at the center of said recesses, grooved swaging rollersmounted in the recesses, gudgeons projecting from Athe center of therollers into the bores, and anti-friction devices surrounding eachgudgeon and interposed between the inner side of the roller and bottomof the recess, lsubstantially as shown and described.

3. A rotary tool for riveting machines, comprising a rotary spindlehaving recesses at its outer end, each recess communicating with a boreextending into the spindle, swaging rollers mounted in the recesses sideby side and having registering peripheral grooves, a pin extendingtransversely through the spindle and engaging in the aforesaid grooves,gudgeons extending Jfrom the center of the sWaging-rollers into thebores, and anti-friction balls surrounding the gudgeons and interposedbetween the inner ends of the swaging-rollers and bottoms oi' therecesses.

4. A rot-ary tool for riveting machines, comprising a rotary spindlehaving recesses in its outer end, said recesses being separated at theirinner ends by a dividing wall, swaging-rollers mounted side by side inthe outer portions of the recesses and having gudgeons projecting intothe inner portions of said recesses, and anti-friction balls surroundingthe gudgeons and interposed between the inner ends of the rollers andbottoms ot the recesses; together with means for holding the rollersrotatably in the spindle, substantially as shown and described.

A rotary tool for riveting machines, comprising a rotary spindle havingrecesses in its outer end, said recesses being separated at their innerends by a dividing wall, swaging-rollers mounted side by side in theouter portions of the recesses and having registering peripheralgrooves, a lockingpin extending transversely through the spindle andengaging in the grooves, gudgcons extending from the center of theswagingrollers into the spindle at the bottom of the recesses, andanti-friction balls in the inner portions of the recesses around thegudgeons and interposed between the inner ends of the rollers andbottoms of the recesses, the antifriction balls for one roller beingseparated from those for the other roller by the aforesaid dividingwall, substantially as shown.

In testimony whereof i have sig-ned my name to this specification in thepresence ot two subscribing witnesses.

WENDELIN l. SENG.

Witnesses FRANK J. SENG,

Ianw. J. SCHAGEN.

